I do believe this is Israel's fault. They should have treated these ships as enemy combatants from the very beginning. Perhaps they will, according to the Jerusalem Post:

Israel will use more aggressive force in the future to prevent ships from breaking the sea blockade on the Gaza Strip, a top Navy commander told The Jerusalem Post on Tuesday.“We boarded the ship and were attacked as if it was a war,” the officer said. “That will mean that we will have to come prepared in the future as if it was a war.”

Notes

(1):

The Guardian, Activists send new boat to challenge Gaza blockade

Pro-Palestinian activists said Tuesday they had sent another boat to challenge the Gaza blockade as Israel faced outrage abroad and questions at home over its botched raid on an aid flotilla in international waters that ended with soldiers killing nine activists.

The raid provoked the most ferocious international condemnation of Israel since its war with the Hamas-controlled Gaza Strip a year and a half ago and appeared likely to increase pressure to end its blockade that has deepened the poverty of the 1.5 million Palestinians living in the strip. The U.N. Security Council condemned the "acts" that resulted in the deaths and called for an impartial investigation.

Greta Berlin of the Free Gaza Movement, which organized the flotilla, said another cargo boat was off the coast of Italy en route to Gaza. A second boat carrying about three dozen passengers is expected to join it, Berlin said. She said the two boats would arrive in the region late this week or early next week.

"This initiative is not going to stop," she said from the group's base in Cyprus. "We think eventually Israel will get some kind of common sense. They're going to have to stop the blockade of Gaza, and one of the ways to do this is for us to continue to send the boats."

Protests have erupted in a number of Muslim countries including Turkey, which unofficially supported the flotilla, Indonesia and Malaysia, where a Palestinian man slashed himself outside the American Embassy.

Within Israel, the raid sparked intense debate over why the military operation went awry.

Israel sent commandos onto the six ships carrying nearly 700 activists after mission organizers ignored the government's weeks-long call to bring the cargo to an Israeli port, where it would be inspected and transferred to Gaza. In most cases, the passengers quickly surrendered. But on the largest ship, the Turkish-flagged Mavi Marmara, the forces encountered resistance.

Israeli commandos rappelled on ropes from a helicopter one by one and amateur videos showed them being attacked by angry activists with metal rods and one soldier being thrown off the ship. Others jumped overboard to escape the angry mob. Israeli authorities said they were attacked by knives, clubs and live fire from two pistols wrested from soldiers. The soldiers then opened fire, killing nine.

(2):

Times Online, UN condemns Israel for attack on aid convoy

Pressure on Israel to lift its blockade of Gaza increased further last night as the UN Security Council demanded a probe into the deadly attack on civilian aid ships in international waters. A Turkish charity in Gaza said that 19 people were missing; Israel put the death toll at 9.

As outrage grew over Israel’s attack on the flotilla of mostly Turkish aid vessels bound for Gaza, Security Council members, who had broken off from their spring holiday to hold an emergency session called for a “prompt, impartial, credible, transparent” investigation into the incident, and the release of all civilians being held by the Israelis.

Israel was called on to explain its use of “disproportionate force” against the humanitarian workers and Ban Ki Moon, the UN Secretary-General, said that he was shocked by the killings and demanded answers urgently.

Riyad Mansour, the Palestinian UN observer, called the attack on unarmed civilians on board foreign ships in international waters a “war crime,” and said it would not stop more ships from attempting to deliver aid to Gaza.